Ability to delete feedback comments
Better post-feedback control of posted comments. You can't delete comments once they are attached to someones account. So, User X could conceivably lie that User Y ripped him off, post a comment and if you aren't moderating all the feedback, it will be stuck and you can't delete it.
I'm probably going to have the wacky ideas I posted here custom coded for my installation. I highly doubt any of these will be implemented in my lifetime (well, except the one that has the developer comment attached).